Bolt



W. L. BELL.

BOLT.

APPLICATION HLED JAN-28, 1920.

1,390,485. PatentedSept. 13,1921.

TINVENTOR Walham. L. 5e 4 WITNESS ATTORNEY "WIL IAM- LVFBEFLL, oF-oAKLANncAeIroR -IA; r;-

To dtl whom it-mayc'mwerm Be: it known that L IVILLIAM L. BELL,- a

citizen of. the United States, and a resident of the city of Oakland,county of Alameda,

and State of California, have made a new f and useful invention, towit, Improvements in Bolts ;--'and I do hereby declare the following. tobe a full, clear, concise, and exact description of the-same. v I

This invention relates particularly to bolts fixation ofbone fracturesand the like.

for surgical purposes for the Among the objects of the invention are to produce a bolt for the purpose, that'maybe readily applied or removed and. that requires;- 1 p I p r .ofadiameter to freely fit th'e'shan'k 3 upon'f 3 which the supplemental flhead slides lintol f the smallest possible incision or displacement of the surrounding tissues in applying the bolt. A further object 'is to provide a supplemental head of such'shape and mode" of application that it may be readily applied to the head of the boltinan awkward position by the sense of feeling of the operator: .:-without visual aid.

Other objects and: advantages will appear as this description-progresses. i

v In this specification and -tlieannexed drawings, the inventlonis illustrated in'the form considered to be the best,'but-it is to be understood that the invention-isnot limited to such form, because it may be embodied inother forms; and it is also to be understood that in and by the claims following the description it is desired to'cover the invention in whatsoever form it may be embodied.

In the accompanying one sheet of drawings.

Figure 1 is a greatly enlarged side elevation of a bolt constructed in accordance with this invention;

Fig. 2 is a plan view of a washer for use upon the same. r

Fig. 3 is a similar View of the supplemental removable head;

Fig. 4 is a diagrammatic view showing'the manner of applying'my invention to thebroken ends of a bone. 7 V V In detail the construction illustrated in the drawings includes the body of the bolt 1,

having a running thread thereon of indeterminate length. The head- 2 of the bolt is of the same dlameter as the body. The shank 3 is ofslightly reduced diameter andintervenes between the body 1 and th shank '3 with a tapered shoulder 5 to form the neck 4. adjacent the shank 3. The bolt is preferably formed of an integral rod having the Specification of LettersPatent.

Application filed -Januaryf28, 1920. Seria1 No."35 1,6 6 1:'.

rat ateeilsepeie;g

and head turned or 'swagea 3' thereupon. The shankQB'is 'preferablyof'a washer 7 p The supplemental-head 8 consists'of a Hat plate preferably of the outline s'hown in .Fig. 3, having the rounded end] 9" and the 'f parallel sides l0'10. -The throatll'i's ofthe proper width to just-passthe diameter of the" neck 4 'freely. Thi's throat flaresfoutwardly to the points 1212 infree curves. This throat le'adsinto the center hole 13 that is I l butment with the underside of -the head '2 5 of the bolt, in which position the holel-3'eng ges the shankl p events the lateral :in the operative 'positioI 1'-."

make the :bolt and the assembled parts of .nicke'l's'teel or other alloy of ro ertrength and having ahigh'resistance to corrosion' or displacement-of the supplemental head when? For ssurglcal purposes it 1 is desirable to" -f rust The various parts maybeplated'to-re sist corrosion, but it is ,no't always' advisable to introduce two -metalsjintoa bolt that may under acid conditions setup electrolysis that -might weaken th structure of'the bolt or the drawings are greatly enlarged .better to accentuate the relative proportions of the various parts. 1

The technique of applying the surgical bolt is substantially as follows: A proper incisionois made through the flesh, then by the use of forceps and clamps and other proper instruments the obliquely broken I ends of the bone are brought to perfect alinement restoring the bone to its length before the fracture occurred. A hole is then drilled through both ends of the bone while they are in registry. This hole is preferably placed, not directly transverse to the axis of the bone, butinclined slightly toward the angle of fracture. The purpose of this slanting of the hole in the general direction'of the line of fracture is to form a. hooklike condition between the ends of the bone and the bolt. This angularity of the bolt also tends better to draw the ends of the pliedby the nut. When the drill is removed from the hole the headQf'of the bolt is in serted through the length of the hole until the end protrudes 'on' the other side of the length, then nipping off the protruding end.

bone. A pair of bent forceps are used to grasp the, "end 9 of'the supplemental head 8, which is then inserted inth'e'incisionandbeneath the bone until the throat 11 engages the neclnt and ithe hole 13 engages thefshank 3 and slides thereoninto contact with the -he a'1d -8ct-from; the shank, without applying.

head 2,, 'llhe washer 7 isgthen placed over thebolt on the :outer .sideof the bone, and

the nuttithreaded onto thezbody li'into contact withjthe washer7, until the necessary amountof draft iswapplied to the bone to-- pre vent'the. dislodgment of the supplemental any; appreciabletension between the head 2" and the nut 6, likely to' setup irritation such asrmight interfere with the: proper knitting off th ee fracture. After the operation Off? placing the bolt the protrudinge'ndof the bolt abovegthe nut 6; is nipped-off With suitablegcutter that will sever the bol-twith abolt constructed ihfaccordance with this. invention-can beappliedthe. minimum of time and the nut screwed into place in the,

most convenient position for the operator} During-the operatti, )n-v of-screwing'on the nut,

it \VQll ldfuSViVQl- 011a thej washer 7 without the 'periosteum offthe bone.

; 'advantag of the bolt within the Wound, wh'i'ch"= leaves the end ut of'sight' of the operator, and

leaving the exposed end of the bolt often cut off at an acute angle that leaves an irr 'itating point, which endangersthe proper healing of the surrounding tissues, allofwhichdis-v present construction.

es areobviously e'li'minatedby the,

Having thus described this invention," what": 7

I claim to secure by Letters Patentis v 1. A bolt having athre'zided portion; a

nut on said portion; a reducedshank form;

ing a head';-a reduced neck, and a supple,-

niental'head slotted to pass said neck'andengage said shank contiguous to said head: '2. A bolt having a threaded portion, a reduced shankforrnlng a head; a-reduced neck; a tapered'shoulder between said shank and neck;- and a s'upplementalvhead slotted clearf -j cut with'out; leaving any sharp ends" likelyf to cause;irritationwhenjthe wound flScCIQSGdJI to pass said neck and engage said shankr 3. A bolt having a reduced :shank form- "ing'a head; a reduced neck; a taperedshoul der between'sald shank and neck yandasupplementalihead slotted with a converging entranceto passsaid neck and engage-saidf 'shankJ- Intestiinonyzwhereof, I :have' hereunto set V 'Inychand at San Francisco, California, this"; .rotatingrimarmanncr lto;displace Onbruise- 21st'day" of January 1920 1 I WILLIAM '1 In presence: of? CLINcoLNJoH soN; 

